would this work - probably not ? https://airlab.parts/collections/recoil-shock/products/lonex-hop-up-unit-tm-sopmod-recoil-shock
or this maybe but 416: http://airsoftzone.co.uk/original-recoil-m4-416-series-hop-up-chamber-part-416-18-tokyo-marui
https://airlab.parts/collections/recoil-shock/products/lonex-hop-up-unit-tm-sopmod-recoil-shock